Production method of foamed sheet

Abstract

The invention discloses a production method of a foamed sheet and aims to provide the production method of the degradable foamed sheet with high thermal insulation performance and low production cost. According to the technical scheme, the production method of the foamed sheet comprises the steps as follows: firstly, preparation: the foamed sheet is prepared from raw materials in parts by weight as follows: 50-70 parts of polypropylene, 20-40 parts of stone powder, 10-20 parts of polylactic acid, 20 parts of fluorocarbon resin, 5 parts of triacetin, 5 parts of methyl silicone oil, 10 parts of aluminum potassium sulfate dodecahydrate, 3 parts of a processing aid, 5-20 parts of a foaming aid, 2-5 parts of a toughening agent and 1-2 parts of a crosslinking agent; secondly, rubber mixing; thirdly, sheet pressing: mixed rubber is fed into an extruder to be extruded into base sheets; fourthly, shaping and laminating: surfaces of the base sheets are flattened, and a plurality of the base sheets are laminated together; fifthly, foaming: the laminated base sheets are placed in a rubber foaming forming machine for vulcanization foaming forming; sixthly, coiling. The production method is applicable to the technical field of plastic foaming.

Description

technical field [0001] The present invention relates to a kind of technical field of plastic foaming, more specifically, it relates to a kind of production method of foam sheet. Background technique [0002] Foamed sheets have the advantages of light weight, heat insulation, cushioning, insulation, anti-corrosion, and low price, so they are usually used as thermal insulation linings in packaging, industry, and construction. Compared with other polyolefins, polypropylene foamed sheets have Greater stiffness, higher strength than polyethylene, superior temperature resistance, better impact toughness than polystyrene, has been considered as an alternative to other thermoplastic foam sheets in industrial applications . [0003] However, the traditional polypropylene foam sheet is easy to cause pollution due to its low degradation rate, and polypropylene needs to rely on oil refining, but oil reserves are gradually decreasing, especially in recent years, considering environmenta...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional polypropylene foam sheet is easy to cause pollution due to its low degradation rate, and polypropylene needs to rely on oil refining, but oil reserves are gradually decreasing, especially in recent years, considering environmental issues, how to reduce the weight of polypropylene The proportion and the reduction of environmental burden have become important issues in technological development; the thickness of the traditional polypropylene foam sheet is relatively thin after molding, and multiple sheets must be laminated and bonded with the molded foam sheet when used; in addition, how to Improving the foaming effect of the foam sheet is particularly important for the thermal insulation performance of the foam sheet